An ordinary young man in the modern forest accidentally traveled to the ancient world of mountains and seas where ferocious beasts were rampant. His body was transformed into a weak human boy who had just stepped into the wilderness. When he was on the verge of being devoured by ferocious beasts, he awakened the Atlas of Beasts and embarked on a legendary story that included all the beasts of the mountains and seas and led the tribe to become bigger and stronger!
